1. Department of Oral and Maxillofacial Surgery; Faculty of Dentistry; Prince of Songkla University; Hatyai; Songkhla; Thailand
2. Department of Materials Science and Technology; Faculty of Science; Prince of Songkla University; Hatyai; Songkhla; Thailand
3. Department of Conservative Dentistry; Faculty of Dentistry; Prince of Songkla University; Hatyai; Songkhla; Thailand
4. Department of Oral and Maxillofacial Surgery; Faculty of Dentistry; the University of Hong Kong; Hong Kong; China